The true story of the investigation of the "Zodiac Killer", a serial killer who terrified the San Francisco Bay Area, taunting police with his ciphers and letters. The case becomes an obsession for three men as their lives and careers are built and destroyed by the endless trail of clues.

As a former London constable, Nicholas Angel finds it difficult to adapt to his new assignment in the sleepy British village of Sandford. Not only does he miss the excitement of the big city, but he also has a well-meaning oaf for a partner. However, when a series of grisly accidents rocks Sandford, Angel smells something rotten in the idyllic village.

Exotic dancer Nicole finds herself terrorized by a black-clad assailant determined on procuring her murdered father's stolen gems. Fleeing Paris in hopes of evading her knife-wielding pursuer, Nicole arrives in England only to discover that death stalks her at every corner.